PDF malware analysis — malicious · c8921b7db5b20753

MALICIOUS

PDF

12.0 KB

MD5: df1471ffb76158719d31daaf967e37fe SHA-1: b3ca4a4a26ff551fcaf19d9d8db75e3607d0c50d SHA-256: c8921b7db5b20753035a11dda81b6e5626cdb05768661f1f6e966275e4c16a89

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The critical heuristic CVE_2007_5659 indicates the exploitation of a known PDF vulnerability using embedded JavaScript. The PDF launcher concatenates info fields, extracts characters at a fixed stride, and evaluates the result. This suggests the primary goal is to execute arbitrary code. The presence of deobfuscated JavaScript files further supports this, indicating a downloader or exploit stage. The ClamAV detection confirms the malicious nature.

Heuristics 5

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Exploit.Agent-36065 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36065
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `9c67560e8c63b720885d3efc1627b844b86a6ec08e99e5b65a22eae832045756`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	431 bytes
`legacy_pdfkit_stage_000.js` `d8534c50a38ae38153a275673bb7b6800f7270c7ecc359615966df291d671eb9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12182 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `fbe5a7169a4be394599c16c1853b14c9d18043a70e02c27ef5795219e3c42d5f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	5065 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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